Pulverizing machine



S. C. MARTIN Oct. 3o, 1923. 1,472,699

PULVERI Z ING MACHINE lFiled April .13, 192s WBTNESS Patented Get. 30, 1923.

STANTON C. MARTIN, 0F ERIE, PENNSYLVANIA.

PULVERIZING MACHINE.

Application tiled April 13, 1923. Serial No. 631,773.

T o all whom it may concern.'

Be it known that I, STANTON C. MARTIN, of Erie, in the county of Erie and State of Pennsylvania, have invented a certain new and useful Improvement in Pulverizing Machines, of `which improvement the following is a specification.

My invention relates to pulverizing machines of the rotating hammer type, and its object is to provide means for the exertion of a higher degree of impactupon the material to be treated, which shall be usefully operative in connection with different methods of removal of the pulverized material from the machine.

The improvement claimed is hereinafter fully set forth. Y

In the accompanying drawing: Figure 1 is a view, partly in side elevation, and partly in vertical central longitudinal section, of a pulverizing machine, illustrating an embodiment of my invention; and, Fig. 2, a vertical transverse section through the same, on the line a a of Fig. 1.

In the practice of my invention, referring descriptively to the specific embodiment thereof which is herein exemplified, I provide a substantial metallic case or chest, 1, which is substantially in the form of two semi-cylindrical chambers, supported on a suitable bed or base, l. The top of the case is closed by a cover plate, 1", having segmental openings in its-ends, to afford access to the interior of the case, which openings are closed by detachable door sections, 1, secured to the cover plate by flanges and bolts, and forming part of the walls of the upper halves of the chambers of the case.

'lwo shafts, 2, 2, are journalled transversely in the case, 1, concentrically with the chambers thereof, in bearings, 2", bolted to standards, 1, on the'bed, 1B. A carrier disc,

3, is fixed on one of the shafts, as the shaft, 2, and a similar carrier disc, 3, is fixed on the other shaft, as the shaft, 2*( Each ofsaid discs carries a plurality of hammers or beaters, 4, in the form of transversely exi tending plates, which are secured to it, 'adjacent to its periphery.` An inlet nozzle, 5, is formed on the cover plate, 1, above one of the chambers of the case, 1, and a delivery nozzle, 6, is formed on said plate, above the other chamber. A delivery pipe, 6, is connected to the nozzle,6.

A. segmental discharge port, 7, is formedin the bottom of each of the chambers of the case, said openings being closed by detachable and renewable steel liners, 7, which may, as hereinafter explained, be either'perforated, as shown in Fig. 1, or imperforat'e. segmental liners, 8, are secured removably in the upper portions of the chambers, serving, as do the liners, 7 a, to take up wear occasioned by the friction of the material which is operated on.

A detachable and renewable deflector, 9, the sides of which are oppositely inclined, is secured to the bottom of the case, between the chambers thereof, and a deflector, 10, the sides of which are also oppositely inclined, is secured detachably to the 'cover plate, between the chambe The deiiectors, 9 and 10, serve to deflect t e material operated on to the proper direction for the most efficient pulverization. Inclined plates, are fixed transversely in the discharge nozzle, 6; air supply passages, 1f, controlled by Adempers, 1g, are formed on the sides of the case; discharge chutes, 1h, extend outwardly from the discharge ports, 7; and a fluid supply pipe, 11, leads into one of the chambers of the case. The fluid supply pipe is controlled by a cock or valve (not shown), and may serve for the admission of an inert gas, as flue gas, to prevent explosion of dust, as when coal is pulverized. It may also be used to dry out any moisture in the case.

The pulverizing machine herein set forth is designed for, and suitably adapted to, op-

eration either in the practice of fine pulverization and the removal of the pulverized material by air separation, or that of only moderately line pulverization, in greater quantity, and the removal of the pulverized material by gravity separation. In the former case, the liners, 7, are imperforate, and in the'latter, they are perforated, as shownin the drawings. The method ofv operation in each of these cases will now be described. p

First, as to fine pulverization and air sep aration. In the practice of this method, the liners, 7, being, as above stated, imperforate, the discs, 3and 3a, are rapidly rotated, in the same direction, as indicated by the arrows in Fig. 1, by connections of their shafts, 2 and 2, with a prime mover, which connections are not shown, as they ma be of any suitable known type, and do not orm part of my present invention. The material to be pulverized .'s supplied to the chambers of the case, through the inlet nozzle, 5, and

falls in front of the rotating hammers, 4, of the disc, 3. The material is thereby broken up, and directed, by the detlector, 10, against the rapidly advancing hammers of the disc, 3", by which it is still finer reduced and tihrown back towards the hammers of the 1sc, finely pulverized. Any material p assing around the chamber of the disc, 3, is thrown upwardly by the deflector, 9, into the path of the hammers of the disc, 3. -The removal of the pulverized material is effected by air separation, air being admitted through the air supply passages, 1, and, by the fan action of the rotatinghammers, being driven towards the delivery nozzle, 6, carrying the pulverized material with it, through the spaces between the inclined plates, 6", by which coarse particles are thrown back to be further pulverized, to the delivery pipe, 6, through which, when the material is coal, it may, to a furnace.

Second, as to coarser pulverization, in greater quantity, and gravity separation, perforated liners, 7, being. before stated, applied. In the practice of this method, the discs, 3 and 3a, are rotated in opposite directions, the disc, 3, being rotated in the direction of the adjacent arrow, and the disc, 3, in the opposite direction, and the deflector, 10, is removed. The material to be pulverized is, as in the former case, supplied throu h. the inlet nozzle, 5, and is thrown backwa and forwards in the chambers of the case by the rapidly and oppositely rotating hammers, unt-il, by impact and attrition, it is reduced to sullcient fineness to allow it to pass through the perforations of the liners, 7", into the discharge chutes, is supplied to asuitable receptacle.

3, until, by impact and attrition, it is,

if desired, be supplied directly.v

l", from which it I claim as my invention and desire to secure by Letters Patent:

1. A pulverizing machine adapted for either line or coarse work, comprising a double semi-cylindrical casing, parallel rotary hammers in said casing, a material inlet ipe leading into one part of the casing, saidp part having also a discharge outlet, a dellector at the top of the casing between the two parts thereof, and a removable perforated screen over said outlet, through which coarsely pulverized material is dlschar d, the hammers in this case being rotate in o psite directions.

2. A pulverizing machine adapted for either fine or coarse work, comprising a double semi-cylindrical casing, parallel rota hammers in said casing, a vertical outlet pipe for finely pulverized material leading from one part of the casing, an air supply pipe leading into the same part, a material feed pipe leading into the other part of the casing, said last mentioned part' having also a discharge outlet, and removable means to close said outlet when air is supplied and-the material is finely pulverized, the hammers in that case being rotated in the same direction,

3.A In a pulverizing machine, a casing .comprising two communicating cylindrica parts, a rotary pulverizer in each of said parts, one of said artshaving an up er material inlet and a ower material out et, and removable means to cover said outlet, the

other of said parts having an upper outlet for line material.

STANTON C. MARTIN.

Witnesses:

'CHARLES A. HAGMANN,

C. S. SPoNsLEx. 

